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·         Autenticación

Certificación con que se testifica la identidad y verdad de algo.

DRAE. Diccionario de la Lengua Española.

Propiedad consistente en que una entidad es lo que dice ser [UNE-ISO/IEC 27000:2014]

Propiedad o característica consistente en que una entidad es quien dice ser o bien que garantiza la fuente de la que proceden los datos. [UNE-71504:2008]

The quality of being genuine or true.

Oxford Advanced Learner's Dictionary.

property that an entity is what it claims to be [ISO/IEC 27000:2014]

(I) The property of being genuine and able to be verified and be trusted.

(See: authenticate, authentication, validate vs. verify.)

[RFC4949:2007]

The property of being genuine and being able to be verified and trusted; confidence in the validity of a transmission, a message, or message originator. [NIST-SP800-53:2013]

Having an undisputed identity or origin.

http://www.ioss.gov/docs/definitions.html

The property of being genuine and able to be verified and be trusted. [NIST-SP800-60V2:2004]

Authenticity is the validity and conformance of the original information.

http://www.sans.org/security-resources/glossary-of-terms/

La propriété qui assure de l'identité d'un sujet ou d'une ressource qui est bien celle pour laquelle elle est clamée et s'applique aux entités telles que les utilisateurs, les process, les systèmes et les informations. [ISO-7498-2:1989]